Every day, consumers give out their credit card or bank account numbers to strangers whom they trust to take out the correct amount and safeguard their sensitive information. "That's terrifying if you really step back and think about it," says Jeremy Allaire of Circle Internet Financial, a startup that's betting the security afforded by public key cryptography will make Bitcoin appealing to consumers. Additionally, millennials who grew up with frictionless, costless, global means of communication will expect the same from their financial interactions and are more likely to embrace crypto-currency, Allaire says.